Best fuel for ecotec?

[Slippy_Trippy]

Well cheap petrol day is rolling around again and since I just put chipped my comode I figure I will try some premium. Is 98 going to give me any better perf/mileage over 98 seeing how I am only driving a 6 or will the chip allow me to utilise premium? What I was told about the chip was that is was for "sportier" shifts and better running on PULP.

So mainly my question is 95 or 98 and which brand do you use in your car (provided it's only stage 1 so I can compare)

-Slippy

[chargedvx6]

Always run 98 no matter what. The ecu will adjust to the better fuel

[Not_An_Abba_Fan]

Thats actually a myth, the ECU doesn't "adjust", it compensates. It just uses alternative fuel maps to get the trim right when driving. I wouldn't use 98 unless the memcal has been specifically tuned for it. Run 95 first and see how it goes.

[Slippy_Trippy]

Shall do

[chargedvx6]

Thats actually a myth, the ECU doesn't "adjust", it compensates. It just uses alternative fuel maps to get the trim right when driving. I wouldn't use 98 unless the memcal has been specifically tuned for it. Run 95 first and see how it goes.

Yeah I agree NAAF but I just stated it in basic terms. The adjustment I referred to was as far as knocking goes. 95ron with knock should equal 98ron with no knock. That's only relevant if knocking/ timing retard was occuring in the first place though.

You refer to fuel maps nut these work in conjunction with knock tables too. In the later models you don't get one without the other unless a tune has been done where the knock sensor sensitivity has been reduced or even turned off. 98 will help reduce any timing retardation. Timing advance = power in any combo

That said, running 95 will feel fine and to compare it to 98 without running the car up on a dyno or with diagnostic equipment hooked up any ill or positive effects will most likely be placebo or imagined.

If you have an after market chip, the chip has probably had fattened fuel trims and advanced timing implemented so that's why I suggested 98. Best off asking the chip writer what they set it up fo at the end of the day

[Not_An_Abba_Fan]

The jump from 95 to 98 may not seem like much, but running 98 if not tuned correctly will result in a loss of power. Especially if the compression isn't high enough.

But you could go the other way, run 98 for a bit and then run 95 and see what happens.

[Slippy_Trippy]

The car was basically empty (naughty naughty ) and I filled with BP Ultimate today. Cost me like $10 more, woopie.

Does feel slightly quicker to take off but still take a moment to decide to do it. A noticable difference though. For the extra $10 I figure it's worthwhile for the car at the least.

-Slippy

[Philthy]

I always use 95 at least, or 98 if I'm planning anything more than a couple trips to the shops in the near future. It's been ages since I used anything less than 95ron, but I can pick the difference between 95 and 98 in my car.
This is for an intake/exhaust/tune ecotec

[vxcalais_01]

LPG is the best fuel hehe

[Ultima RB]

Hehe, yeah another + for LPG. I just got 500km (highway) out of $30...

[Not_An_Abba_Fan]

And with liquid LPG injection and the right tune, it craps all over 98 for power too.

[Slippy_Trippy]

And with liquid LPG injection and the right tune, it craps all over 98 for power too.

Liquid Liquid Petroleum Gas Injectors

Does gas burn hotter or take longer to ignite etc? What is the difference between LPG and petrol (NOT THE BLATANTLY OBVIOUS ANSWER)

-Slippy

[Not_An_Abba_Fan]

The reason I put liquid LPG is because using a carby it is vapour, but injecting it as liquid is more efficient and gives more power.

LPG burns slower and is harder to ignite, it also is a lot cooler when injected. With the right tuning it is a higher performing fuel than petrol, when injected as a liquid. It's octane rating is 108.

[maldotcom2]

The difference between 91 and 95 is night and day.

[Full Spectrum]

I ran 95 in the old VP Ping ping.. 98 no Ping. Run 98 in the VT always.

[LowVZ]

agreed^^^

[vxcalais_01]

Agreed on the previous comments on LPG. I was expecting more BBQ gas comments hehe. Maintenance cost reducing now as well, stainless leads are common place, Bosch now released newly researched LPG Platinum specific plugs (Double platinum fine tip plug with a gap of 0.7mm) are excellent, running fantastic in my car and made to last the 30,000k's. Also starting to pop up more regularly i have seen in Melbourne is LPG Dyno Tuners. Some high profile performance places doing the same.

[Slippy_Trippy]

Liquid Liquid Petroleum Gas Injectors

Does gas burn hotter or take longer to ignite etc? What is the difference between LPG and petrol (NOT THE BLATANTLY OBVIOUS ANSWER)

-Slippy

Cheers for clearing that up, sorry to be a smartarse .


So I assume then that LPG engines ave much higher compression since the fuel takes longer to spark. I think that works.

Noticable difference with 98 + Chip = 98 for future fillups. What's $10 a tank vs Performance, Economy and at the very least Piece of mind?

-Slippy

[Slippy_Trippy]

"It is better to be silent and thought a fool than to open your mouth and prove it."

I find it's better to open your mouth and be sure. Otherwise you break something and then you are an even bigger fool

[wrx884]

Depends on wat the tuner did 2 ur chip we cant really say till u know that, but with mine (greenfoam chip) the timing was advanced 4 degrees and somthing else but ud have 2 check with him on wat it was but ive found i get more KMs out of the 98, only bout 40-50kms approx

[petersmith]

only ever 98 for last 8 yrs never had a problem

[VYMAD]

Always 95 except occaisionally 98- all good.

[HARVZ-6]

From personal experience... i wouldnt bother with anything over normal unleaded unless its boosted or high performance..

i ran 98 in my l67 for awhile but the cost was ridiculous.. started trying 95 and it ran better when driving it hard etc

then again it runs just as good on bio 94 but with worse economy..

[Not_An_Abba_Fan]

So I assume then that LPG engines ave much higher compression since the fuel takes longer to spark. I think that works.

You can run much higher compression with LPG, up to 13:1 without any drama.

[greenfoam]

Most low compression engine run best on 91, 95 ifyou are running alot of timing. But it's not like a modern efficient engine where you are runn 10:1 compression and above, those things go best on 98 and most of them actually can ping on 91 straight out of the factory